Piston and piston ring for internal combustion engines



Feb. 9, 1932. H. TEETOR 1,844,923

PISTON AND PISTON RING FOR INTERNAL COMBUSTION ENGINES Filed June 16, 1930 I ifitfezzfor', J7"77(6(7? 226107" @7 M, MW/M M Patented Feb. 9, 1932 UNITED STATES .PATENT OFFICE nEauAN rEn'roa, or EAGERSTOWN, INDIANA, AssIeNoa 'r'o r m manner emote coxvrA Y, or HAGEBSTOWN, INDIANA, A CORPORATION or INDIANA PISTON AND rrs'roN RING ron INTERNAL comans'rron ENGINES Application filed June 16,

My invention relates to pistons and piston rings for internal combustion. engines and more particularly to that type of ring known as oil rings which are employed to remove excess oil from the cylinder walls and permit it to return to the crank case of the engine.

The principal object of my invention is to provide a novel oil ring having elongated slots and a continuous groove in its inneror back face with whichrthe inner ends of the slots communicate.

My invention is explained more fully by reference to the accompanying drawings in which: p

Fig. 1 illustrates a ring, embodying my invention, appliedto a piston of an Internal combustion engine, the fragments of the partsbeing shown in longitudinal .cross section; and Fig. 2 is a plan View of the ring with a small section broken away. The section through the ring as shown in Fig. 1 is taken on the line l1 of Fig. 2,

bustion engine, is provided "with the usual plain rings 5. The inner groove 6 in the piston is connected to the interior of the piston by drain openings 6.which permit the oil scraped from the cylinder wall to be returned to the crank. case. Seated in the groove 6 is my improved oil ring 7 My improved ring 7 is provided with elongated slots 8 equally spaced and extending from the exterior face of the ring to a con tinuous annular compensating groove 9 formed in the interior or back face of the ring. The groove 9 is preferably substantially wider than the slots 8 which preferably have converging ends forming the sidesof the. generally triangular-shaped arts or bridges '10 between the adjacent en s of the slots. At each bridge, except at the bridges 10 adjacent the joint or split 12, the groove 9 is provided with a recess 11 to reduce the size of the bridges.

' I have found that wlth a ring having al ng gated oil slots but no compensating grootjef the ring in use does not maintain its true err:

The piston 3 which is adapted to recip rocate in the cylinder 4 of an. internal com-' 1930. Serial li'o. 81,317.

cular form because the ring is not of uniform cross sectlon, the ring being solid in cross section at the bridges and hollow at the slots.

As a result, the bridges cause high spots on the exterior face of the ring with attend-. ant excessive wear of the ring and cylinder against the cylinder wall. Further, as the groove 9 in the inner face of the ring connects the. various slots 8, the oil scraped from the cylinder wall and conveyed through the slots, may be distributed by and along this groove more evenly and drained off through the drain openings in the piston, thus making the ring more efficient than would be the case if no communicating groove were provided.

I claim:

In combination with a piston for an internal combustion engine, having a piston ring groove with apertures extending from the back of the groove to the interior of the piston to permit the draining of oil to the crank case, of a piston ring mounted in the groove and having closely adjacent, elongated slots forming separating bridges triangular in shape and a continuous compensating groove in the interior face of the ring and in the zone of the slots and bridges with remy name.

HERMAN TEETOR. 

